The larger the contact area between the tire and the ground, the greater the friction between the car and the ground, and the energy loss caused by friction will then be greater, the source of total energy allowing the car to move. It's oil. The more energy we lose, the more oil we burn. When you replace the original small diameter tires with larger diameter tires, the benefit you feel is that the car is more powerful and the power output is greater. However, your original car's brake rotors have not been replaced and are still the same size.
Electronic sensors calculate kilometers and miles more accurately. No matter how you change the tire hub size, your actual kilometers can be accurately calculatedi.e. one wheel change. size will not affect mileage. Torque on the wheel = forcedriving force of the rim * radius of the tire. Torque is the product of arm force and moment. Can all friends understand this simple truth? Thanks to this formula, we can see that when the torque released by the motor is constant, the radius of the tire becomes larger.
In our opinion, high-performance car tires are relatively wide and look majestic. This is because the wider the tire (with the same tire pattern), the larger the contact area between the tire and the ground, and the corresponding cornering, straight-line acceleration and stronger grip will be obtained . Once tire size is changed, handling will inevitably change. As mentioned above when talking about acceleration, as the contact patch with the ground increases, the grip of the tires will be stronger. This is why supercars are equipped with big, wide and thin tires.
This is how the so-called influence of one thing affects everythingthe body. Replacing tires of different sizes not only has such an impact, but also if you modify tires, brake discs, steering wheels, chassis suspension, etc. Corresponding changes must be made. The values displayed on the instrument during actual driving of enlarged tires do not match, and the actual vehicle speed will be faster than the displayed speed. lead to speeding. The front wheels are widened and although grip is improved, the steering feel is also fuzzy and front wheels that are too wide will also affect the turning radius.
Is the friction between the car and the ground harmful when driving?
Um, I suddenly thought of this question, and Baidu got lots of facts but no answers. My point is work.
Does friction work when a person walks? From this sentence we can see that “no one » here refers to a whole or a system, not to feet. Therefore, human movement at present cannot be equated with the movement of the feet, but must be equated with the movement of the center of gravity. When a person walks, his feet alternately support each other. When the foot tends to slide forward relative to the ground, the frictional force shifts backward, and vice versa. Since people as a system move forward relative to the ground, we can roughly think of the friction force and the horizontal component of the person's backpedaling force as equal in magnitude and opposite in direction. That is, the friction force moves forward and, although the feet do not move relative to the ground, the person's center of gravity moves forward relative to the ground. Friction therefore has a positive effect.
In order to deepen understanding, you can give such an example. on a horizon surfaceabsolutely smooth slab, install a long post with uniform mass distribution. When the long pole falls, how will the center of gravity of the long pole shift? The answer is that the center of gravity falls vertically from half the height to the horizontal plane. Because no force acts on the long rod in the horizontal direction. But what if it's not a smooth horizontal surface? If the long pole falls forward, the bottom must be subjected to forward friction. At this time, the forward distance of the center of gravity of the long pole corresponds to the displacement of the long pole, so that the friction force does positive work.
This example is very similar to people walking. There is no relative movement of the contact surface, but the center of gravity of the system is moved. To determine if an object has a displacement, the most important thing is to determine itscenter of gravity rather than its contact surface.
Second, let me refute the point of view in the answer above. The answer above mentioned that "cars obtain energy by relying on ground friction, and cars can also use no fuel." is incorrect. Car tires are a rolling process. The contact area between the tire and the ground will move backward relative to the ground, and the ground will move forward against the friction force of the car, so the friction force will do positive work. This friction force and the force of the tire rotating backwards form a pair of action force and reaction force. If the tire did not rotate, there would be no friction. Naturally, the car will not move forward. Therefore, the energy required for the forward motion of the car comes from the rotation of the car's tires. It is not true that it can move without fuel.
In terms of driving alone, friction is beneficial. Friction can produce a reaction force with the wheels to move the car forward, if there is no friction, you can imagine what will happen when you drive a car on ice. ! Friction is also beneficial for the brakes. Without friction, the car cannot be stopped, but friction is detrimental to fuel consumption. The higher the coefficient of friction, the greater the fuel consumption!